/*
 * Copyright 2010-2013 Coda Hale and Yammer, Inc., 2014-2017 Dropwizard Team
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.dropwizard.metrics;

import org.junit.Test;

import io.dropwizard.metrics.DerivativeGauge;
import io.dropwizard.metrics.Gauge;

import static org.assertj.core.api.Assertions.assertThat;

public class DerivativeGaugeTest {
    private final Gauge<String> gauge1 = () -> "woo";
    private final Gauge<Integer> gauge2 = new DerivativeGauge<String, Integer>(gauge1) {
        @Override
        protected Integer transform(String value) {
            return value.length();
        }
    };

    @Test
    public void returnsATransformedValue() throws Exception {
        assertThat(gauge2.getValue())
                .isEqualTo(3);
    }
}
